JPH0636085B2 - Endoscope - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to an endoscope in which the internal structure of the tip component body is improved.

[Prior Art] Generally, as an endoscope, for example, JP-A-62-150212 is used.
As described in the publication, an objective lens is mounted axially movably in the main body of the distal end portion of the insertion portion, and the objective lens is axially moved through an operation wire along with the operation of the operation mechanism on the near side. There is known a structure in which a lens position adjusting mechanism for adjusting the focal position of the objective lens or the magnification is provided by moving the lens in a desired direction. In this case, the objective lens is held by the lens frame, and the lens frame is held by the holding member so as to be movable in the axial direction. further,
A lens mounting hole is formed in the body of the distal end portion, and the lens frame holding member is fixed in the lens mounting hole.

Further, one end of the operation wire is connected to the lens frame. The other end side of the operation wire extends to the operation part on the near side and is connected to an operation mechanism attached to the operation part. Then, the lens frame is moved in the axial direction via the operation wire in accordance with the operation of the operation mechanism of the near side operation unit, and the position of the objective lens is adjusted.

By the way, in this type of endoscope, by providing a guide pipe fixed to a holding member in the body of the distal end forming section, and inserting the distal end side of the operation wire into the guide pipe,
A structure has been developed in which the distal end side of the operating wire is covered to smoothly guide the pushing / pulling operation of the operating wire.
In this case, a wire fixing portion is provided on the outer peripheral surface of a substantially cylindrical cylinder forming the frame body of the lens frame, and one end of the operation wire is fixed to this wire fixing portion. Further, a guide pipe fixing portion is provided at a position corresponding to the wire fixing portion of the lens frame on the outer peripheral surface of the substantially cylindrical tubular body forming the lens frame holding member main body. A guide pipe insertion hole is formed in the guide pipe fixing portion, and the guide pipe is fixed while being inserted in the guide pipe insertion hole. Further, the lens mounting hole in the body of the tip forming portion is provided with a body side mounting hole into which a substantially cylindrical tubular portion forming the lens frame holding member body is inserted, and the wire on the outer peripheral surface of the lens frame is formed. A fixing portion passage hole is formed for allowing the fixing portion and the guide pipe fixing portion on the outer peripheral surface of the lens frame holding member body to pass therethrough.

When assembling the endoscope, each mounting component and tip component mounted in the tip component body to prevent foreign matter such as dust from entering the tip component body into which the objective optical system is mounted. A low-temperature curable rubber adhesive such as silicone rubber is applied to the gap between the joints with the main body to prevent foreign matter such as dust from entering the tip constituent body.

[Problems to be Solved by the Invention] In the conventional structure, the wire passes through the wire fixing portion on the outer peripheral surface of the lens frame and the guide pipe fixing portion on the outer peripheral surface of the lens frame holding member body in the lens mounting hole in the body of the tip forming portion. For example, by filling the opening part with a relatively large opening area such as the fixing part passage hole with an adhesive of low temperature curing type rubber such as silicon rubber, foreign matter such as dust enters the tip component body. I was trying to prevent it. However, it is difficult to fill a low-temperature curable rubber such as silicone rubber into an opening portion having a relatively large opening area such as a fixed portion passage hole, and at the time of the low-temperature curable rubber filling operation, the tip portion inside the main body There is a problem that the work becomes more difficult due to interference with the mounted guide pipe and other components. Therefore, it is difficult to reliably close an opening portion having a relatively large hand opening area such as the fixed portion passage hole portion.Therefore, in the conventional structure, dust is not collected from the fixed portion passage hole portion into the tip component body. However, there is a problem in that it is not possible to prevent foreign matter such as foreign matter from entering, and foreign matter such as rubber that has entered the body of the tip forming portion adheres to the lens surface of the objective lens or the like and hinders observation.

The present invention has been made in view of the above circumstances, and is for passing the wire fixing portion on the outer peripheral surface of the lens frame and the guide pipe fixing portion on the outer peripheral surface of the lens frame holding member main body in the lens mounting hole in the main body of the distal end portion. It is possible to reliably close an opening with a relatively large opening area such as the fixed part passage hole, prevent foreign matter such as dust from entering the tip body, and always observe in a good condition. It is intended to provide an endoscope capable of observing the image of.

[Means for Solving the Problem] The present invention is provided with a closing member 44 for closing the space formed between the lens mounting hole 30 of the distal end constituent body 8 and the guide pipe 40 and the holding member 27. .

[Operation] By closing the space formed between the lens mounting hole 30 of the tip forming section body 8 and the guide pipe 40 and the holding member 27 by the closing member 44, foreign matter such as dust is removed from the tip forming section body 8. Foreign matter such as dust adheres to the lens surface of the objective lens 24 by preventing the foreign matter such as dust from entering the tip forming body 8 through the space formed between the lens mounting hole 30, the guide pipe 40 and the holding member 27. It is designed to prevent such a situation.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a front end forming portion 2 of an insertion portion 1 of the endoscope shown in FIG.
1 shows a schematic configuration of the inside of. In FIG. 2, reference numeral 3 is an operating portion to which the proximal end portion of the insertion portion 1 of the endoscope is connected, and 4 is a universal cord in which the proximal end portion is connected to the operating portion 3. A connector 5 is provided at the tip of the universal cord 4. Further, the operation section 3 is provided with an eyepiece section 6 at the rear end thereof, and an air supply / water supply switch (not shown), a suction switch, a bending operation switch, an angle lock / free switching switch, etc. are provided on the side. Each is provided. Further, a focus adjustment ring 7 is provided on the eyepiece portion 6 of the operation portion 3. The focus adjustment ring 7 is connected to a focus adjustment operation mechanism (not shown) mounted in the operation unit 3.

In addition, a substantially cylindrical tip cover 9 is attached to the tip component body 8 of the tip component 2. Further, as shown in FIG. 3, a cover lens 11 of the objective optical system 10 and a cover lens 11 of the objective optical system 10 are provided on the front surface 8a of the body 8 for forming the tip.
Illumination lenses 12 and 12 of the illumination optical system are arranged on both sides of, respectively, and are mounted in a liquid-tight state.

Further, a nozzle 13 for supplying air and water is attached to the front surface 8a of the main body 8 of the tip forming section. The nozzle 13 is arranged on an inclination axis b inclined by a predetermined angle from an axis a passing through the center of the cover lens 11 in FIG. 3, and is arranged obliquely above the left side of the cover lens 11. In this case, the front surface 8a of the body 8 of the distal end portion is formed by an inclined surface inclined by a predetermined angle with respect to the direction orthogonal to the axial direction of the insertion portion 1 as shown in FIG. Further, the center line c of the nozzle mounting hole 14 formed in the tip forming portion main body 8 is formed substantially orthogonal to the front surface 8a of the tip forming portion main body 8. Further, as shown in FIGS. 5 and 6, the nozzle 13 has an injection port 13b at the tip with respect to the nozzle body 13a.
The side is bent at a substantially right angle, and the ejection port 13b of the nozzle 13 is installed so as to face the cover lens 11. In addition, a communication hole 15 that communicates with the nozzle mounting hole 14 is formed in the tip component body 8. Further, the communication hole 15 is connected to the air / water supply channel 17 of the endoscope through the connection pipe 16, and the water supply from the nozzle 13 can wash off the dirt on the surface of the cover lens 11. There is.

In addition, inside the body 8 of the distal end forming section, together with the mounting hole 18 of the objective optical system 10 and the nozzle mounting hole 14 of the nozzle 13 for air and water supply shown in FIG. 1, a forceps insertion channel is provided as shown in FIG. 19 mounting holes 20, for example, a pair of light guide fibers 21 formed by optical fibers,
Mounting holes 22 and 22 of 21 are formed respectively. In this case, the light guide fiber 2 in the mounting holes 22 and 22
The front end portions of the light guide fibers 21 and 21 are arranged to face the lens surfaces of the illumination lenses 12 and 12, and the base end portions of the light guide fibers 21 and 21 are inserted into the insertion portion 1, the operation portion 3 and the universal cord 4. And is connected to the connector 5. By connecting this connector 5 to a light source device (not shown), the illumination light from this light source device is made incident on the incident ends of the light guide fibers 21, 21. This illumination light is the light guide fiber 2
The light guide fibers 21 and 21 are guided to the tip forming section 2 by the reference numerals 1 and 21, and emitted from the tip of the light guide fibers 21 and 21 to pass through the illumination lenses 12 and 12 to illuminate the subject.

Further, in the objective optical system 10, a prism 2 for optical path conversion is provided.
3, the cover lens 11 is provided in front of the prism 23, and the objective lens 24 is provided behind the prism 23. In this case, the prism 23 is held in a state where it is integrally joined to a prism frame (frame pair) 25 having a substantially rectangular frame shape. Further, the objective lens 24 is a substantially cylindrical lens frame 2
The lens frame 26 is integrally mounted inside the lens 6, and is held by a holding member 27 having a substantially cylindrical shape so as to be movable in the axial direction. Further, the cover lens 11 and the accommodating seat 28 of the prism frame 25 of the prism 23 and the prism 2 are provided in the mounting hole 18 of the objective optical system 10 of the tip component body 8.
Lens mounting holes 30 for mounting the third accommodation chamber 29 and the objective lens 24 are formed respectively. Then, the prism frame 25 is attached to the accommodation seat 28 in a state where the prism 23 is inserted into the accommodation chamber 29 of the tip configuration body 8, and subsequently the cover lens 11 is attached to the accommodation seat 28. ing. In this case, the entire circumference is bonded between the prism 23 and the prism frame 25, between the prism frame 25 and the housing seat 28, and between the cover lens 11 and the housing seat 28 with an adhesive such as low temperature curing rubber. The space between the cover lens 11 and the prism 23 is maintained in a sealed state.

Further, the holding member 27 of the lens frame 26 is inserted into the lens mounting hole 30 of the body 8 and is fixed by, for example, a fixing screw. At the base end of the lens frame holding member 27, the front end of an image guide fiber 31 formed of, for example, an optical fiber is fixed. The image guide fiber 31 is inserted into the insertion portion 1 and extends to the eyepiece 6 side.

Further, a wire fixing portion 32b is projectingly provided on the outer peripheral surface of a substantially cylindrical tubular body 32a forming the frame body of the lens frame 26, and one end of the operation wire 33 is fixed to the wire fixing portion 32b. There is. It should be noted that one end of the operation wire 33 is joined to a substantially tubular wire stopper 34 with solder 35, and then the wire fixing portion 32 is bonded with an adhesive 36.
It is adhesively fixed to b. Furthermore, this operation wire 33
The other end side of the is extended to the operating portion 3 on the near side, and is connected to an operating mechanism for focus adjustment mounted on the operating portion 3. The focus adjustment operation mechanism pushes and pulls the operation wire 33 as the focus adjustment ring 7 rotates. And these focus adjustment rings 7,
Operation mechanism for focus adjustment, operation wire 33, lens frame 26
A lens position adjusting mechanism for adjusting the focal position or the magnification of the objective lens 24 by moving the lens frame 26 in the axial direction by the holding member 27 along with the rotating operation of the focus adjusting ring 7 via the operation wire 33 is formed. There is.

Further, a guide pipe fixing portion 37b is provided in a protruding manner at a position corresponding to the wire fixing portion 32b of the lens frame 26 on the outer peripheral surface of the substantially cylindrical tubular body 37a forming the main body of the lens frame holding member 27. A guide hole 38 for guiding the movement of the wire fixing portion 32b of the lens frame 26 is formed. A guide pipe insertion hole 39 is formed in the guide pipe fixing portion 37b, and the guide pipe insertion hole 3 is formed.
The guide pipe 40 of the operation wire 33 is inserted and fixed in the inside 9. In addition, a lens-side mounting hole 41 into which a substantially cylindrical tubular body 37a forming the body of the lens frame holding member 27 is inserted is formed in the lens-mounting hole 30 in the body 8 of the distal end forming section. Lens frame 26
Outer peripheral wire fixing portion 32b and lens frame holding member 2
A fixing portion passage hole portion 42 for passing the guide pipe fixing portion 37b on the outer peripheral surface of the main body 7 is formed. In addition,
The guide hole 38 of the lens frame holding member 27 is formed up to the position of the tip of the lens frame holding member 27. And
A tip ring 43 is fitted on the tip of the lens frame holding member 27, and the tip ring 43 prevents the tip side of the lens frame holding member 27 from being deformed inward.

Further, the lens mounting hole 30 of the tip component body 8, the guide pipe 40, and the lens frame holding member 27 are provided at a portion of the rear end portion of the tip component body 8 corresponding to the fixing portion passage hole 42 of the lens mounting hole 30. A narrow member 44 is attached to close the space formed between the two. This closing member 44
Is formed of an elastic material in substantially the same shape as the space formed between the lens mounting hole 30 of the body 8 and the guide pipe 40 and the lens frame holding member 27. Further, as shown in FIG. 8, an insertion hole 45 of the guide pipe 40 is formed in the closing member 44 in a state of penetrating between both end surfaces. Further, a slit 46 for assembly work is formed at the bottom of the closing member 44.
Then, at the time of assembly, with the adhesive such as low temperature curing type rubber applied to the outer peripheral surface of the guide pipe 40 and the outer peripheral surface of the closing member 44 in advance, the guide pipe 40 is inserted into the closing member 44 through the slit 46 of the closing member 44. In the state where the guide pipe 40 is fitted in the insertion hole 45 and thus the guide pipe 40 is attached to the lens pipe holding member 27, the lens frame holding member 27 to which the guide pipe 40 is fixed is attached to the lens attaching hole 30 of the tip constituting body 8. There is. In this case, between the closing member 44 and the guide pipe 40, between the closing member 44 and the lens mounting hole 30 of the tip component body 8, and between the closing member 44.
The lens frame holding member 27 and the lens frame holding member 27 are held in close contact with each other.

Therefore, in the structure described above, the space formed between the lens mounting hole 30 of the distal end component body 8 and the guide pipe 40 and the lens frame holding member 27 is closed by the closing member 44, so that dust or the like is generated. Foreign matter can be prevented from entering into the tip component body 8 through the space formed between the lens mounting hole 30 of the tip component body 8 and the guide pipe 40 and the holding member 27. It is possible to prevent foreign matter such as the like from adhering to the lens surface of the objective lens 24. Therefore, it is possible to reliably prevent foreign matter such as dust that has entered the body 8 of the distal end portion from attaching to the lens surface or the like of the objective lens 24 and obstructing the observation as in the related art. Further, the assembling work is facilitated as compared with the conventional case where the opening portion having a relatively large opening area such as the fixed portion passing hole portion 42 of the lens mounting hole 30 is filled with a low temperature curable rubber such as silicone rubber. It is possible to improve the assembling workability.

Further, at the time of assembly, an adhesive such as a low temperature curable rubber is applied to the outer peripheral surface of the guide pipe 40 and the outer peripheral surface of the closing member 44 in advance, so that the closing member 44 and the tip forming portion are provided between the closing member 44 and the guide pipe 40. Since the lens mounting hole 30 of the main body 8 and the closing member 44 and the lens frame holding member 27 are firmly adhered to each other, foreign matter such as dust may be prevented from entering the tip forming portion main body 8. It can be prevented more reliably.

Further, between the prism 23 and the prism frame 25, between the prism frame 25 and the housing seat 28, and the gabber lens 11
The entire circumference is adhered between the housing and the housing seat 28 with an adhesive such as low temperature curing type rubber, and the space between the cover lens 11 and the prism 23 is kept in a sealed state. It is possible to prevent moisture from entering the part main body 8.

Further, as shown in FIG. 4, the front surface 8a of the tip forming portion main body 8 is formed by an inclined surface inclined by a predetermined angle with respect to the direction orthogonal to the axial direction of the insertion portion 1, and the tip forming portion main body 8 is formed.
Since the center line c of the nose attachment hole 14 of the front surface 8a of the front end portion 8a is formed substantially orthogonal to the front surface 8a of the tip forming portion body 8, the front surface 8a of the tip forming portion body 8 is in a direction orthogonal to the axial direction of the insertion portion 1. An inclined surface b formed by an inclined surface inclined at a predetermined angle with respect to the air supply / water supply nozzle 13 and inclined at a predetermined angle from an axis a passing through the center of the cover lens 11 in FIG.
The ejection port 13 of the nozzle 13 even when arranged above
The longitudinal direction of b can always be held in parallel with the front surface 8a of the tip forming body 8. Therefore, the entire bottom portion of the injection port 13b of the air / water supply nozzle 13 is attached to the tip component body 8
Since the front surface 8a of the nozzle 13 can be held in contact with the front surface 8a, the adjustment work of the ejection direction of water, air or the like from the ejection port 13b of the nozzle 13 can be facilitated. Further, the nozzle 13 can be formed in a simple shape as compared with the case where the center line c of the nozzle mounting hole 14 is arranged in parallel with the axial direction of the insertion portion 1 as shown by a virtual line in FIG. Therefore, the molding operation of the nozzle 13 can be facilitated.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the case where the present invention is applied to the lens position adjusting mechanism for adjusting the focus position is shown. However, by changing the configuration of the objective lens 24, the same applies to the lens position adjusting mechanism for the zoom mechanism that changes the magnification. Needless to say, the present invention may be applied, and various modifications can be made without departing from the scope of the present invention.

[Effects of the Invention] According to the present invention, since the closing member for closing the space formed between the lens mounting hole of the body of the tip forming portion and the guide pipe and the holding member is provided, the lens mounting in the body of the tip forming portion is provided. To securely block an opening portion having a relatively large opening area such as a fixing portion passage hole portion for passing the wire fixing portion on the lens frame outer peripheral surface of the hole and the guide pipe fixing portion of the lens frame holding member main body outer peripheral surface. Therefore, it is possible to prevent foreign matter such as dust from entering the body of the tip forming section and always observe the image of the observation target in a good state.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a longitudinal sectional view of a main part, FIG. 2 is a side view showing a schematic structure of the entire endoscope, and FIG. The front view shown in FIG. 4, FIG. 4 is a schematic configuration diagram showing an attached state of the air / water feeding nozzle, FIG. 5 is a front view showing the air / water feeding nozzle, FIG. 6 is a side view of the same, and FIG. FIG. 8 is a cross-sectional view showing the internal structure, and FIG. 8 is a perspective view showing a closing member. 8 ... Tip component body, 24 ... Objective lens, 26 ...
Lens frame, 27 ... Lens frame holding member, 30 ... Lens mounting hole, 33 ... Operating wire, 40 ... Guide pipe, 44 ... Closing member.

Claims (1)

[Claims] 1. A lens frame for holding an objective lens, and a holding member for holding the lens frame movably in an axial direction,
The holding member is fixed in the lens mounting hole in the body of the distal end portion, one end of the operation wire is connected to the lens frame, and the other end of the operation wire is connected. Accordingly, a lens position adjusting mechanism that adjusts the position of the objective lens unit by moving the lens frame in the axial direction via the operation wire is provided, and the operation wire is covered by covering the distal end side of the operation wire. In an endoscope in which a guide pipe for guiding a guide is fixed to the holding member, a closing member that closes a space formed between the lens mounting hole of the tip component body and the guide pipe and the holding member is provided. An endoscope characterized by that.